Part A: The number of cubic feet of water, y, in a pool z hours after the water starts flowing into the pool is a linear function. The points (40,3000) and (60, 4000) lie on Calculate the slope of the line. the line of the function. Part B: What does the slope of the line represent in Part A? Explain in your own words and use complete sentences. Part C: Explain how the slope formula is related to the definition of slope. Use complete sentences.